DC power supply for locally controlled card reader

[Gilf]

Hi,

I am very new at the card reader and access stuff. I have a few locally controlled card readers that require Dc power supplies.

This is what information I have from the catalogue (I've also attached the cutsheet to my post).

Specifications
Voltage
12/24 VDC
Current
60mA @ 12VDC or 69mA @24VDC
Inputs
1 REX
Relays
2 each; voltage 2 amps @ 12-24VAC/DC

Firstly, does this mean that I need to supply 69mA @24Vdc or 2A @ 24Vdc?

In either case, can someone shoot me in the right direction to what type of power supply I can use for these.

Thanks in advance!

 

[GoldDigger]

It seems to me that the relay specification is the contact rating, not the coil power.

Sent from my XT1585 using Tapatalk

 

[Besoeker]

It seems to me that the relay specification is the contact rating, not the coil power.

Sent from my XT1585 using Tapatalk

I agree - 48W dissipated in a relay coil ......not likely.

 

[gar]

161207-0819 EST

Very clearly you need a DC supply as specified. If the DC supply is going to be located a long distance from the reader, then use 24 V to allow for line voltage drop. If the supply is located close to the reader, then use a 12 V unit. Mouser has lots of different supplies. I get rather small units that at 9 V are 600 mA. Without looking the same device in 24 V is probably at least 200 mA. Some of these will be good for about 100 to 250 V input and moderately well regulated on output.

The relay output contact is rated 2 A and there are two different relays, or possibly it is a single double pole relay. This is probably a mechanical relay with isolated contacts.

I have no idea what a REX input is.

.

 

[texie]

161207-0819 EST

Very clearly you need a DC supply as specified. If the DC supply is going to be located a long distance from the reader, then use 24 V to allow for line voltage drop. If the supply is located close to the reader, then use a 12 V unit. Mouser has lots of different supplies. I get rather small units that at 9 V are 600 mA. Without looking the same device in 24 V is probably at least 200 mA. Some of these will be good for about 100 to 250 V input and moderately well regulated on output.

The relay output contact is rated 2 A and there are two different relays, or possibly it is a single double pole relay. This is probably a mechanical relay with isolated contacts.

I have no idea what a REX input is.

.

REX = "request to exit"

 

[texie]

Hi,

I am very new at the card reader and access stuff. I have a few locally controlled card readers that require Dc power supplies.

This is what information I have from the catalogue (I've also attached the cutsheet to my post).

Specifications
Voltage
12/24 VDC
Current
60mA @ 12VDC or 69mA @24VDC
Inputs
1 REX
Relays
2 each; voltage 2 amps @ 12-24VAC/DC

Firstly, does this mean that I need to supply 69mA @24Vdc or 2A @ 24Vdc?

In either case, can someone shoot me in the right direction to what type of power supply I can use for these.

Thanks in advance!

You need 60 mA @ 12 volt or 69 mA @ 24 volt, your choice. The contacts are rated for 2 amps so you have to add the load of what ever you are powering. You need to be careful with the type of power supply you use as many types of locking devices have very high in rush and there are power supplies made geared for the access control industry. Altronix is one of the best known.

 

[Gilf]

Would I be in code violation if I do not locate the DC power supplies in an electrical room? What I'm actually after is am I allowed to locate these in the ceiling space near the doors where I would be feeding the card readers from them as long as they are 'arranged and secured to allow access' as per NEC 300.23?